CVE-2025-12978

Nov. 28, 2025, 3:21 p.m.

5.4
Medium

Description

Fluent Bit in_http, in_splunk, and in_elasticsearch input plugins contain a flaw in the tag_key validation logic that fails to enforce exact key-length matching. This allows crafted inputs where a tag prefix is incorrectly treated as a full match. A remote attacker with authenticated or exposed access to these input endpoints can exploit this behavior to manipulate tags and redirect records to unintended destinations. This compromises the authenticity of ingested logs and can allow injection of forged data, alert flooding and routing manipulation.

Product(s) Impacted

Vendor Product Versions
Treasuredata
  • Fluent Bit
  • 4.1.0

Weaknesses

Common security weaknesses mapped to this vulnerability.

*CPE(s)

Affected systems and software identified for this CVE.

Type Vendor Product Version Update Edition Language Software Edition Target Software Target Hardware Other Information
a treasuredata fluent_bit 4.1.0 / / / / / / /

References

https://fluentbit.io/announcements/v4.1.0/

Tags

cret@cert.org
NVD-CWE-noinfo
2025-11-24
CVE-2025-12978

CVSS Score

5.4 / 10

CVSS Data - 3.1

  • Attack Vector: NETWORK
  • Attack Complexity: LOW
  • Privileges Required: LOW
  • Scope: UNCHANGED
  • Confidentiality Impact: NONE
  • Integrity Impact: LOW
  • Availability Impact: LOW

    • CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

    View Vector String

Timeline

Published: Nov. 24, 2025, 3:15 p.m.
Last Modified: Nov. 28, 2025, 3:21 p.m.

Status : Analyzed

CVE has had analysis completed and all data associations made.

More info

Source

cret@cert.org

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.